Seat arm



FIG. 1 is an outer arm front side perspective view of a seat arm showing my new design;

FIG. 2 is a top front perspective view thereof;

FIG. 3 is a side elevational view, the opposite side being a mirror image thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a inner arm side perspective view thereof.

The views of the seat arm not shown form no part of the claimed design. The broken lines depicting top cross members, top drink tray, lower vertical members, and wrapping joints represent environmental elements only and form no part of the claimed design. 

The ornamental design for a seat arm, as shown and described. 